I have a 26 foot high tunnel with a tent stove. Frankly, I have found that composting raised beds do good job of heating it. The stove is for brief, extreme, temperature plunges. I also keep over 100 gallons of water in it.
To be is to do …Kant
To do is to be ..Nietzsche
Do be do be do…Sinatra
Scooby dooby do …St. Thomas
I'm thinking solar electric panels would be too inefficient to heat a greenhouse. Solar thermal may be worthwhile but you'd need a lot of them. Better greenhouse design (insulation, passive solar) is probably where I'd start my efforts.
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I'm all tasted up for a BLT! This tiny ad wants a monte cristo!